why can linux not replace windows? simple direct X. its closed and to reverse engineer is 50 years in prison. 90% of the big games out there are DX based, so linux and MacOS and everything else is limited. If we can find a way to shut out DX or to find a superior alternative windows has no technical redeeming qualities.
Um your ignoring the fact that people do more with there computers and game.
Also DX 8.1 and older have been reverse enginered along with a part of of direct X 10.